Create Arm64 packages for flatpak

[Siedlerchr]

Is your suggestion for improvement related to a problem? Please describe.
JabRef now offers arm64/aarch64 packages for Linux. We should also offer them as Snap

Describe the solution you'd like
Modify the snapcraft so support linux aarch64 as well

Additional context
Snapcraft:
https://github.com/JabRef/jabref/blob/main/snap/snapcraft.yaml

flatpak:
https://github.com/flathub/org.jabref.jabref/blob/master/org.jabref.jabref.yaml

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[Siedlerchr]

@jetbrains-junie try again

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[Siedlerchr]

Snapcraft is now solved. Flatpak will be done when we have a 6.0 relesae